using System;
using System.Collections.Generic;
using System.ComponentModel.Composition;
using System.ComponentModel.Composition.Hosting;
using System.Linq;
using Caliburn.Micro;

namespace OrbitOne.CRMLyncInfoDashboard.PartCatalogs
{
    public class AppBootstrapper<T> : Bootstrapper<T>
	{
		CompositionContainer container;

		/// <summary>
		/// By default, we are configured to use MEF
		/// </summary>
		protected override void Configure()
		{
		    var catalog = new AggregateCatalog(new XapNamespaceCatalog("OrbitOne.CRMLyncInfoDashboard"));

			container = CompositionHost.Initialize(catalog);

			var batch = new CompositionBatch();

			batch.AddExportedValue<IWindowManager>(new WindowManager());
			batch.AddExportedValue<IEventAggregator>(new EventAggregator());
			batch.AddExportedValue(container);
		    batch.AddExportedValue(catalog);

			container.Compose(batch);
		}

		protected override object GetInstance(Type serviceType, string key)
		{
			string contract = string.IsNullOrEmpty(key) ? AttributedModelServices.GetContractName(serviceType) : key;
			var exports = container.GetExportedValues<object>(contract);

			if (exports.Count() > 0)
				return exports.First();

			throw new Exception(string.Format("Could not locate any instances of contract {0}.", contract));
		}

		protected override IEnumerable<object> GetAllInstances(Type serviceType)
		{
			return container.GetExportedValues<object>(AttributedModelServices.GetContractName(serviceType));
		}

		protected override void BuildUp(object instance)
		{
			container.SatisfyImportsOnce(instance);
		}

	}
}
